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Interaction of nucleoplasmin with core histones
Carme Arnan1, Núria Saperas, Cèlia Prieto
1Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain.
The Journal of Biological Chemistry
|June 7, 2003
Summary
Nucleoplasmin pentamers bind core histones for chromatin remodeling in Xenopus oocytes. This interaction is not solely electrostatic, suggesting a crucial role for hydrophobic forces in histone deposition.
Area of Science:
- Molecular Biology
- Developmental Biology
- Biochemistry
Background:
- Nucleoplasmin is a major protein in Xenopus laevis oocytes.
- It plays a key role in chromatin remodeling post-fertilization.
- Nucleoplasmin facilitates the removal of sperm proteins and deposition of somatic histones.
Purpose of the Study:
- To investigate the binding properties of nucleoplasmin with core histones.
- To understand the molecular interactions involved in histone deposition onto male pronuclear chromatin.
Main Methods:
- Sedimentation velocity analysis
- Sedimentation equilibrium analysis
- Sucrose gradient fractionation
Main Results:
- Nucleoplasmin pentamers bind histone octamers (H2A, H2B, H3, H4) without preference.
- Modification of histone N-terminal tails or nucleoplasmin C-terminal tracts did not affect binding.
- The interaction involves non-electrostatic forces, likely hydrophobic, in addition to ionic interactions.
Conclusions:
- Nucleoplasmin-histone complex formation is not exclusively electrostatically driven.
- Hydrophobic interactions are critical for the association between nucleoplasmin and histones.
- These findings shed light on the mechanism of histone deposition during early development.